Maleic anhydride hydrogenation preheater

Abstract

The utility model relates to a technical field of chemical equipment provides a maleic anhydride hydrogenation preheater, include: preheater body and distributor, preheater body is equipped with mutually isolated pipe channel and shell side channel, and the pipe channel is used for the high temperature heat medium into, the first end of shell side channel is equipped with first inlet, and the second end of shell side channel is equipped with first outlet, and first inlet is connected with the inlet pipe, is equipped with baffle assembly between first inlet and first outlet, and baffle assembly helical extension along shell side channel to form spiral flow channel, and the distributor includes the first pipe section and second pipe section of being linked, wherein the second pipe section is inserted in the inlet pipe, and the first pipe section is equipped with gas phase inlet and liquid phase inlet, and the second pipe section is the porous structure, the utility model discloses maleic anhydride hydrogenation preheater, and the distributor of inlet pipe installation can be used to pre-mix gas phase reactant and liquid phase reactant, and cooperate the baffle assembly in shell side channel to make the reactant mixing more fully even.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a maleic anhydride hydrogenation preheater. Background Technology

[0002] 1,4-Butanediol (BDO) and its derivatives are high-value-added fine chemical products. In existing technologies, the preparation of 1,4-butanediol typically employs a maleic anhydride hydrogenation catalytic method. This hydrogenation of maleic anhydride usually requires preheating the reactants to allow them to reach the reaction temperature more quickly. However, in existing preheaters, the reactants are not uniformly mixed after being added, leading to uneven temperature distribution and potentially affecting the subsequent reaction rate. Utility Model Content

[0003] This invention provides a maleic anhydride hydrogenation preheater to solve the problem of uneven preheating caused by uneven mixing of reactants in the preheating process of maleic anhydride hydrogenation in the prior art.

[0004] This utility model provides a maleic anhydride hydrogenation preheater, comprising: The preheater body has a tube-side channel and a shell-side channel that are isolated from each other. The tube-side channel is used to introduce a high-temperature heat medium. The first end of the shell-side channel has a first inlet and the second end of the shell-side channel has a first outlet. The first inlet is connected to an inlet conduit. A baffle assembly is provided between the first inlet and the first outlet. The baffle assembly extends spirally along the shell-side channel to form a spiral flow channel. The distributor includes a first pipe section and a second pipe section connected together, wherein the second pipe section is inserted into the inlet conduit, the first pipe section is provided with a gas phase inlet and a liquid phase inlet, and the second pipe section has a porous structure.

[0005] According to the maleic anhydride hydrogenation preheater of this utility model, the gas phase inlet is located at the end of the first pipe section away from the second pipe section, and there are multiple liquid phase inlets, which are arranged circumferentially at intervals on the outer peripheral wall of the first pipe section.

[0006] According to the maleic anhydride hydrogenation preheater of this utility model, the outer peripheral wall of the second pipe section is provided with a stop portion, which abuts against the inner wall of the inlet conduit.

[0007] According to the maleic anhydride hydrogenation preheater of this utility model, the inlet conduit includes a horizontal pipe section and a vertical pipe section that are perpendicularly connected to each other; the second pipe section is inserted into the horizontal pipe section, and the vertical pipe section is connected to the first inlet.

[0008] According to the maleic anhydride hydrogenation preheater of this utility model, the tube-side channel includes: A front-side inlet tube box is located at the first end of the preheater body, and the front-side inlet tube box is provided with a second inlet. A front tube outlet tube box is located at the first end of the preheater body, and the front tube outlet tube box is provided with a second outlet. The rear tube box is located at the second end of the preheater body; Multiple heat exchange tubes are provided, some of which are located between the front tube inlet box and the rear tube box to connect the front tube inlet box and the rear tube box; another portion of the heat exchange tubes are located between the rear tube box and the front tube outlet box to connect the front tube outlet box and the rear tube box; the shell-side channel is arranged around the outside of the heat exchange tubes.

[0009] According to the maleic anhydride hydrogenation preheater of this utility model, the heat exchange tube includes: tube body; Spiral fins are disposed on the outer peripheral wall of the tube body and extend spirally along the length of the tube body.

[0010] According to the maleic anhydride hydrogenation preheater of this invention, the spiral fins and the baffle assembly rotate in opposite directions.

[0011] According to the maleic anhydride hydrogenation preheater of this utility model, a plurality of heat exchange tubes are arranged in a square array in parallel.

[0012] According to the maleic anhydride hydrogenation preheater of this utility model, the baffle assembly includes a plurality of baffle units connected in sequence. The baffle unit includes a sector plate and a triangular plate, the triangular plate being arranged parallel to the extending direction of the shell-side channel; the arc-shaped edge of the sector plate abuts against the inner wall of the shell-side channel, the first side of the sector plate is connected to the first side of the triangular plate, the second side of the sector plate is connected to the second side of the triangular plate of the baffle unit located behind it, and the second side of the triangular plate is connected to the second side of the sector plate of the baffle unit located in front of it. The sector plate has through holes corresponding to the positions of the heat exchange tubes.

[0013] According to the maleic anhydride hydrogenation preheater of this utility model, the triangular plate is an isosceles triangle, the first right-angled side of the triangular plate is parallel to the extension direction of the shell-side channel, the first side of the sector plate is connected to the hypotenuse of the triangular plate, the second side of the sector plate is connected to the second right-angled side of the triangular plate of the baffle plate unit located behind, and the second right-angled side of the triangular plate is connected to the second side of the sector plate of the baffle plate unit located in front.

[0014] This invention relates to a maleic anhydride hydrogenation preheater. The tube-side channel is used to introduce a high-temperature heating medium, while the shell-side channel is used to introduce reactants (maleic anhydride, hydrogen, and solvent), allowing the reactants to be preheated by the high-temperature heating medium. Simultaneously, a distributor installed in the inlet conduit at the first inlet of the shell-side channel can be used to premix the gaseous and liquid reactants, and the pores in the second tube section further promote more uniform and thorough mixing of the gaseous and liquid reactants. As the reactants enter the shell-side channel, they are further thoroughly mixed under the disturbance of the spiral baffle assembly, ensuring uniform and thorough preheating. This effectively solves the problem of uneven preheating caused by uneven mixing in the preheating process of maleic anhydride hydrogenation in existing technologies. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the maleic anhydride hydrogenation preheater provided in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the distributor provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the heat exchange tube provided in an embodiment of the present invention.

[0019] Figure 4 This is a cross-sectional view of the maleic anhydride hydrogenation preheater provided in an embodiment of this utility model.

[0020] Figure 5 This is a partial schematic diagram of the baffle assembly provided in an embodiment of the present invention.

[0021] Figure label: 1. Maleic anhydride hydrogenation preheater; 11. Preheater body; 111. Tube-side passage; 1111. Front tube-side inlet tube box; 1112. Front tube-side outlet tube box; 1113. Rear tube box; 1114. Heat exchange tube; 11141. Tube body; 11142. Spiral fins; 1115. Second inlet; 1116. Second outlet; 112. Shell-side passage; 1121. First inlet; 1122. First outlet; 113. Inlet conduit; 1131. Horizontal pipe section; 1132. Vertical pipe section; 114. Baffle assembly; 1141. Baffle unit; 11411. Sector plate; 11412. Triangular plate; 12. Distributor; 121. First pipe section; 1211. Gas phase inlet; 1212. Liquid phase inlet; 122. Second pipe section; 123. Stop section. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] The following is combined Figures 1-5 This invention describes a maleic anhydride hydrogenation preheater.

[0024] like Figure 1 As shown, this utility model provides a maleic anhydride hydrogenation preheater 1, including: a preheater body 11 and a distributor 12. The preheater body 11 has a tube-side channel 111 and a shell-side channel 112 that are isolated from each other. The tube-side channel 111 is used to introduce a high-temperature heat medium. The first end of the shell-side channel 112 has a first inlet 1121 and the second end of the shell-side channel 112 has a first outlet 1122. The first inlet 1121 is connected to an inlet conduit 113. A baffle assembly 114 is provided between the first inlet 1121 and the first outlet 1122. The baffle assembly 114 extends spirally along the shell-side channel 112 to form a spiral flow channel. The distributor 12 includes a first tube section 121 and a second tube section 122 connected to each other. The second tube section 122 is inserted into the inlet conduit 113. The first tube section 121 has a gas phase inlet 1211 and a liquid phase inlet 1212. The second tube section 122 has a porous structure.

[0025] In this embodiment, the tube-side channel 111 inside the preheater body 11 is used to introduce a high-temperature heat transfer medium (such as heat transfer oil), and the inlet conduit 113 installed at the first inlet 1121 of the shell-side channel 112 is used to introduce reactants (maleic anhydride, hydrogen and solvent) into the shell-side channel 112 so as to heat the reactants through indirect heat exchange between the high-temperature heat transfer medium and the reactants, and discharge the preheated reactants from the first outlet 1122. Meanwhile, a distributor 12 is installed at the inlet conduit 113. The gas phase inlet 1211 of the first pipe section 121 of the distributor 12 is used to introduce gaseous reactants (such as hydrogen), and the liquid phase inlet 1212 is used to introduce liquid reactants (such as maleic anhydride). The gaseous reactants and liquid reactants can be initially mixed during the flow through the first pipe section 121 and the second pipe section 122, and enter the inlet conduit 113 and the shell-side channel 112 through the pores of the second pipe section 122. During this process, the gaseous reactants are sheared and broken into a large number of extremely fine bubbles, and evenly seep into the cavity of the inlet conduit 113 so as to mix more fully and evenly with the liquid reactants.

[0026] In addition, the shell-side channel 112 is provided with a baffle assembly 114 extending along a spiral. The gaseous reactants and liquid reactants can be mixed more fully and evenly under the disturbance of the baffle assembly 114, and the spiral flow channel can extend the heat exchange path to ensure the preheating effect of the gaseous reactants and liquid reactants.

[0027] The maleic anhydride hydrogenation preheater 1 of this invention has a tube-side channel 111 for introducing a high-temperature heat medium and a shell-side channel 112 for introducing reactants (maleic anhydride, hydrogen, and solvent) to preheat the reactants with the high-temperature heat medium. Simultaneously, a distributor 12 installed on the inlet conduit 113 at the first inlet 1121 of the shell-side channel 112 can be used to premix the gaseous and liquid reactants, and further promotes more uniform and thorough mixing of the gaseous and liquid reactants through the pores of the second tube section 122. When the reactants enter the shell-side channel 112, they can be further thoroughly mixed under the disturbance of the spiral baffle assembly 114, and the reactants can be uniformly and thoroughly preheated, effectively solving the problem of uneven preheating caused by uneven mixing in the preheating process of maleic anhydride hydrogenation reactants in the prior art.

[0028] The second pipe section 122 can be made of metal powder sintered pipe.

[0029] Alternatively, the distributor 12 may also be any one of a Venturi ejector type, a perforated plate type, or a static mixer type distributor.

[0030] In some embodiments, such as Figure 1 and Figure 2As shown, the gas inlet 1211 is located at the end of the first pipe section 121 away from the second pipe section 122. There are multiple liquid inlets 1212, which are arranged circumferentially on the outer peripheral wall of the first pipe section 121.

[0031] In this embodiment, a gas phase inlet 1211 is provided at the end of the first pipe section 121, allowing gaseous reactants to enter the first pipe section 121 from the end. A plurality of liquid phase inlets 1212 are provided on the outer peripheral wall of the first pipe section 121, allowing liquid phase reactants to enter the first pipe section 121 from the liquid phase inlets 1212. The gaseous and liquid phase reactants entering the first pipe section 121 from the end and side respectively can disturb each other, so that the two are mixed more thoroughly and evenly.

[0032] Specifically, in some embodiments, such as Figure 1 and Figure 2 As shown, a stop portion 123 protrudes from the outer peripheral wall of the second pipe section 122, and the stop portion 123 abuts against the inner wall of the inlet conduit 113.

[0033] In this embodiment, by providing a stop portion 123 on the outer peripheral wall of the second pipe section 122, the stop portion 123 can be used to block the gap between the inlet conduit 113 and the second pipe section 122, preventing reactants from flowing into the inlet conduit 113 from the gap between the inlet conduit 113 and the second pipe section 122.

[0034] In this embodiment, as Figure 1 As shown, the inlet conduit 113 includes a horizontal pipe section 1131 and a vertical pipe section 1132 that are perpendicularly connected to each other; the second pipe section 122 is inserted into the horizontal pipe section 1131, and the vertical pipe section 1132 is connected to the first inlet 1121.

[0035] In this embodiment, the inlet conduit 113 is divided into a horizontal pipe section 1131 extending in the horizontal direction and a vertical pipe section 1132 extending in the vertical direction. The vertical pipe section 1132 is used to be directly connected to the first inlet 1121, and the horizontal pipe section 1131 is used to be inserted into the distributor 12, so that the distributor 12 can be set in the horizontal direction, so that the liquid phase reactants and gas phase reactants can flow and mix in the horizontal direction after entering the distributor 12, and the mixing is more thorough and uniform.

[0036] Specifically, in some embodiments, such as Figure 1 As shown, the first inlet 1121 is located at the bottom of the preheater body 11, and the first outlet 1122 is located at the top of the preheater body 11.

[0037] In some embodiments, such as Figure 1 and Figure 3As shown, the tube-side channel 111 includes: a front tube-side inlet tube box 1111, a front tube-side outlet tube box 1112, a rear tube box 1113, and multiple heat exchange tubes 1114; the front tube-side inlet tube box 1111 is located at the first end of the preheater body 11, and the front tube-side inlet tube box 1111 has a second inlet 1115; the front tube-side outlet tube box 1112 is located at the first end of the preheater body 11, and the front tube-side outlet tube box 1112 has a second outlet 1116; the rear tube box 1114... 113 is located at the second end of the preheater body 11; part of the heat exchange tube 1114 is located between the front tube inlet tube box 1111 and the rear tube box 1113 to connect the front tube inlet tube box 1111 and the rear tube box 1113; another part of the heat exchange tube 1114 is located between the rear tube box 1113 and the front tube outlet tube box 1112 to connect the front tube outlet tube box 1112 and the rear tube box 1113; the shell-side channel 112 is arranged around the outside of the heat exchange tube 1114.

[0038] In this embodiment, the front tube inlet box 1111 is provided with a second inlet 1115, which can be used to introduce high-temperature heat medium, and the front tube outlet box 1112 is provided with a second outlet 1116, which can be used to discharge the high-temperature heat medium after heat exchange. In this embodiment, the front tube inlet box 1111 and the front tube outlet box 1112 are both located at the first end of the preheater body 11, and the rear tube box 1113 is located at the second end of the preheater body 11. The front tube inlet box 1111 and the rear tube box 1113, and the rear tube box 1113 and the front tube outlet box 1112 are respectively connected by heat exchange tubes 1114, so that the high-temperature heat medium can move along the path of front tube inlet box 1111-heat exchange tube 1114-rear tube box 1113-heat exchange tube 1114-front tube outlet box 1112, and exchange heat with the reactants in the heat exchange tubes 1114 and the shell-side channel 112 outside the heat exchange tubes 1114. The heat exchange path of the high-temperature heat medium is extended without extending the length of the heat exchange tubes 1114, so that the high-temperature heat medium can fully release heat and improve energy utilization.

[0039] Specifically, in some embodiments, such as Figure 2 As shown, the heat exchange tube 1114 includes: a tube body 11141 and spiral fins 11142; the spiral fins 11142 are disposed on the outer peripheral wall of the tube body 11141 and extend spirally along the length direction of the tube body 11141.

[0040] In this embodiment, by providing spiral fins 11142 on the outer peripheral wall of the tube body 11141, the spiral fins 11142 can increase the heat exchange area between the heat exchange tube 1114 and the reactants, thereby improving the thermal efficiency. At the same time, the spiral fins 11142 can further agitate the reactants, allowing the various components of the reactants to mix more fully and evenly.

[0041] Specifically, in some embodiments, the spiral fins 11142 and the baffle assembly 114 rotate in opposite directions. In this embodiment, by reversing the rotation directions of the spiral fins 11142 and the baffle assembly 114, the disturbances exerted by the spiral fins 11142 and the baffle assembly 114 on the reactants are opposite in direction when the reactants flow along the baffle assembly 114 and come into contact with the spiral fins 11142. This results in more intense turbulence generated by the two opposing disturbances, further enhancing the mixing of the various components of the reactants.

[0042] Specifically, in some embodiments, such as Figure 1 and Figure 4 As shown, multiple heat exchange tubes 1114 are arranged in a square array in parallel. In this embodiment, the multiple heat exchange tubes 1114 are arranged in a square array, which allows for more uniform and sufficient contact with the high-temperature heat medium in the shell-side channel 112, thereby improving heat exchange efficiency.

[0043] Specifically, in some embodiments, such as Figure 1 and Figure 5 As shown, the baffle assembly 114 includes multiple baffle units 1141 connected in sequence; each baffle unit 1141 includes a sector plate 11411 and a triangular plate 11412, with the triangular plate 11412 and the shell-side channel 112 extending in parallel directions; the arc-shaped edge of the sector plate 11411 abuts against the inner wall of the shell-side channel 112, the first side of the sector plate 11411 is connected to the first side of the triangular plate 11412, the second side of the sector plate 11411 is connected to the second side of the triangular plate 11412 of the rear baffle unit 1141, and the second side of the triangular plate 11412 is connected to the second side of the sector plate 11411 of the front baffle unit 1141; the sector plate 11411 has through holes corresponding to the positions of the heat exchange tubes 1114.

[0044] It is understood that the sector plate 11411 includes an arc-shaped edge and two radially extending sides connected to the arc-shaped edge, and the triangular plate 11412 has three sides; wherein, the extending directions of the triangular plate 11412 and the shell-side channel 112 are parallel, and the extending directions of the sector plate 11411 and the shell-side channel 112 are angled. The sector plate 11411 can block the flow of reactants along the extending direction of the shell-side channel 112 and guide the reactants to flow at an angle relative to the extending direction of the sector plate 11411 and the shell-side channel 112. The gaps between adjacent baffle plate units 1141 form a spiral flow channel for the spiral flow of reactants. The sector plate 11411 has through holes corresponding to the positions of the heat exchange tubes 1114 for the heat exchange tubes 1114 to pass through.

[0045] The inner wall of the through hole and the outer wall of the heat exchange tube 1114 are fitted with a clearance of less than or equal to 0.5 mm. This design effectively suppresses the vibration of the heat exchange tube 1114 while allowing for thermal expansion.

[0046] The helical angle between two adjacent baffle units 1141 is 35° to 45°. This preferred larger helical angle generates more intense turbulence, greatly enhances radial mixing, and ensures sufficient micro-mixing of the gas and liquid phases. Preferably, the helical angle between two adjacent baffle units 1141 is 40°.

[0047] Specifically, in some implementations, such as Figure 5 As shown, the triangle 11412 is an isosceles triangle. The first right-angled side of the triangle 11412 is parallel to the extending direction of the shell-side channel 112. The first side of the sector plate 11411 is connected to the hypotenuse of the triangle 11412. The second side of the sector plate 11411 is connected to the second right-angled side of the triangle 11412 of the baffle unit 1141 located at the rear. The second right-angled side of the triangle 11412 is connected to the second side of the sector plate 11411 of the baffle unit 1141 located at the front.

[0048] Specifically, the projection of the sector plate 11411 onto a plane perpendicular to the extension direction of the shell-side channel 112 is a quarter circle.

[0049] The preheater body 11, heat exchange tube 1114, sector plate 11411 and triangular plate 11412 can all be made of austenitic stainless steel 316L or higher grade corrosion-resistant alloy components.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A maleic anhydride hydrogenation preheater, characterized in that, include: The preheater body has a tube-side channel and a shell-side channel that are isolated from each other. The tube-side channel is used to introduce a high-temperature heat medium. The shell-side channel has a first inlet at its first end and a first outlet at its second end. The first inlet is connected to an inlet conduit. A baffle assembly is provided between the first inlet and the first outlet. The baffle assembly extends spirally along the shell-side channel to form a spiral flow channel. The distributor includes a first pipe section and a second pipe section connected together, wherein the second pipe section is inserted into the inlet conduit, the first pipe section is provided with a gas phase inlet and a liquid phase inlet, and the second pipe section has a porous structure.

2. The maleic anhydride hydrogenation preheater according to claim 1, characterized in that, The gas phase inlet is located at the end of the first pipe section away from the second pipe section. There are multiple liquid phase inlets, which are arranged circumferentially on the outer peripheral wall of the first pipe section.

3. The maleic anhydride hydrogenation preheater according to claim 1, characterized in that, The outer peripheral wall of the second pipe section is provided with a stop portion, which abuts against the inner wall of the inlet conduit.

4. The maleic anhydride hydrogenation preheater according to claim 1, characterized in that, The inlet conduit includes a horizontal pipe section and a vertical pipe section that are perpendicularly connected to each other; the second pipe section is inserted into the horizontal pipe section, and the vertical pipe section is connected to the first inlet.

5. The maleic anhydride hydrogenation preheater according to claim 1, characterized in that, The tube passage includes: A front-side inlet tube box is located at the first end of the preheater body, and the front-side inlet tube box is provided with a second inlet. A front tube outlet tube box is located at the first end of the preheater body, and the front tube outlet tube box is provided with a second outlet. The rear tube box is located at the second end of the preheater body; Multiple heat exchange tubes are provided, some of which are located between the front tube inlet box and the rear tube box to connect the front tube inlet box and the rear tube box; another portion of the heat exchange tubes are located between the rear tube box and the front tube outlet box to connect the front tube outlet box and the rear tube box; the shell-side channel is arranged around the outside of the heat exchange tubes.

6. The maleic anhydride hydrogenation preheater according to claim 5, characterized in that, The heat exchange tube includes: tube body; Spiral fins are disposed on the outer peripheral wall of the tube body and extend spirally along the length of the tube body.

7. The maleic anhydride hydrogenation preheater according to claim 6, characterized in that, The spiral fins and the baffle assembly rotate in opposite directions.

8. The maleic anhydride hydrogenation preheater according to claim 5, characterized in that, The heat exchange tubes are arranged in a square array in parallel.

9. The maleic anhydride hydrogenation preheater according to claim 5, characterized in that, The baffle assembly includes multiple baffle units connected in sequence; The baffle unit includes a sector plate and a triangular plate, the triangular plate being arranged parallel to the extending direction of the shell-side channel; the arc-shaped edge of the sector plate abuts against the inner wall of the shell-side channel, the first side of the sector plate is connected to the first side of the triangular plate, the second side of the sector plate is connected to the second side of the triangular plate of the baffle unit located behind it, and the second side of the triangular plate is connected to the second side of the sector plate of the baffle unit located in front of it. The sector plate has through holes corresponding to the positions of the heat exchange tubes.

10. The maleic anhydride hydrogenation preheater according to claim 9, characterized in that, The triangular plate is an isosceles triangle. The first right-angled side of the triangular plate is parallel to the extension direction of the shell-side channel. The first side of the sector plate is connected to the hypotenuse of the triangular plate. The second side of the sector plate is connected to the second right-angled side of the triangular plate of the rear baffle unit. The second right-angled side of the triangular plate is connected to the second side of the sector plate of the front baffle unit.

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